<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../../vue.js"></script>
</head>
<body>
    <div id="app">
        <p>{{a}}</p>
        <p>{{b}}</p>
        <button @click="add">点击加1</button>
    </div>
    <script >
        Vue.config.productionTip = false;
        // 只更新改变的哪个节点
        const vm = new Vue({
            el:'#app',
            data:{
                a:'1',
                b:'2'
            },
            methods:{
                add(){
                    console.log(this.a++);
                }
            }
        })

    </script>
</body>
</html>